Influence of Bond Parameters and Surface Roughness on the Lap Shear Strength of the Adhesively Bonded 3D Printed PLA Parts

Abstract

Now-a-days, the multi-material structure is being increasingly used in wide range of applications. One of the important techniques for joining multi-material structures is to use the structural adhesives. Adhesively bonded joints have numerous advantages over traditional joining techniques such as reduced weight, low cost, more uniform stress distributions, ability to join dissimilar materials and absence of damage in the bonded parts. These joints play a crucial role in increasing the structural integrity and overall performance of the additively manufactured parts. This study investigates the effect of bond parameters and surface roughness on the lap shear strength of the adhesively bonded 3D printed PLA parts. The fused deposition modeling (FDM) based 3D printing method was used to fabricate the PLA adherends and single lap joints (SLJ) were prepared to assess the adhesive performance of the joint. The results revealed that bond strength is significantly influenced by the surface roughness and the bond parameters. These findings will provide the guidelines for designers and engineers seeking robust and durable joints in 3D printed assemblies.